PyDocURLProtocol example (was: [Pyobjc-dev] crasher demo app)

[Bob I. <bo...@re...>]

On Mar 25, 2004, at 6:03 PM, Bob Ippolito wrote:

>
> On Mar 25, 2004, at 4:23 PM, Ronald Oussoren wrote:
>
>>
>> On 25-mrt-04, at 22:08, Burris T. Ewell wrote:
>>
>>> First off, I appreciate all of the help here...
>>>
>>> On Mar 25, 2004, at 12:19 PM, Ronald Oussoren wrote:
>>>> If I remove those calls the application runs longer, e.g. it didn't 
>>>> crash yet :-)
>>>
>>> I don't think that's it...  I tried that, holding a reference to the 
>>> cell, and also retaining the application delegate that holds 
>>> references to the controller objects.  Still, inside the cell, the 
>>> controller attribute disappears inside drawInteriorWithFrame.  Here 
>>> is a traceback from the full application, which is pretty much the 
>>> same as the demonstration.  This shouldn't be possible since the 
>>> cell sets self.controller inside of init() and nowhere else is the 
>>> attribute removed.
>>
>> Hmm, doesn't NSTableView use -copy? That might explain why 
>> self.controller disappears.
>>
>> There's definitly something fishy going on,
>
> There's fishy things with threads in PyObjC in general.. try this, for 
> example (I just ran into this bug today):
>
> http://undefined.org/~bob/PyURLProtocol_broken.tgz
>
> My guess is that it doesn't release the GIL when doing the call, so 
> when it gets the callback it can't acquire the GIL and deadlocks.

Just to follow this up, the barrage of recent GIL-related checkins have 
fixed this issue and I've created an example that uses it:
	Examples/PyDocURLProtocol

The GUI sucks, because it's just a web-browser-with-no-support-code, 
but I think it demonstrates the URL protocol well enough.  Feel free to 
spice it up.

-bob